EDIT: This fix worked for me so far.

I found this on steam threads and thought I'd try it since after research it seemed like a harmless, easily reversible tweak.

" This may not work for you, but it worked for me. Haven't tested in VR yet.

Been battling for days and wondering why everything seemed to be doubled (load times) or halved (detail in distance, creatures half rendered, trees half rendered and framerates halved). Then I remembered windows does certain things on timers and...it's complicated, doesn't matter.

Try this on the command line - you have to be administrator.

bcdedit /deletevalue useplatformclock
bcdedit /deletevalue tscsyncpolicy
bcdedit /deletevalue disabledynamictick

Then restart. "

Afaik the important value is the platform clock (HPET).
Here are initial results of my testing:

I had a look into this before trying it and it seemed relatively harmless so I gave it a shot. Disabling HPET (use platform clock) in Windows and briefly booting NMS resulted in a steady 60fps for new game. I then disabled it also in BIOS also and rebooted. Testing NMS after that on a new game just seemed to hang on the starfield load screen forever. Tried again, same thing.

Reenabled in BIOS and turned off in windows - booted again & back to crap fps. I'm confused.
On another note - It's quite frustrating not being able to tell how long loading should take when starting a game before deciding it's not working. Sometime a new game'll load, sometimes it won't and I can't tell.

EDIT: enabled all three, disabled, rebooted and tried again. left BIOS alone (HPET still on there). New game started at 60fps. Old game loaded almost instantly at 60fps.
Further testing for responsiveness, stability, effects on other games etc needed but thus far looking good.

Perhaps some tinkering with HPET in windows and/or BIOS will help you out.
/EDIT

So I've tested an old save and a new save on NMS after updating to Beyond and it all seems to be working ok (apart from GOG overlay, but oh well). The kicker is that my framerate has literally halved - before the update I was gettting a steady 60fps or just under on med-high settings. Now I'm getting below 30 and my graphics settings actually seem lower - AF and antialiasing settings are lower than they were before, and all the other graphics settings are just on 'enhanced' (I prev had a mix of med-high and the game ran great, even with light shafts and tesselation on). This seems like an awfully big drop to be fixed by minor graphical tweaking anyway.
Is the game just way more resource intensive now, or are there more tweaks I can make?

I'm running an AMD-FX8350 OC to 4.2Ghz, GTX970 4gb (small OC too) and 16GB RAM. Nothing intense running in background.
Ingame VSync is off, triple buffering and vsync via Nvidia control panel. Graphics drivers are latest.

Edit. dropped almost all settings. no difference. The game is sitting at 29fps even just looking at the menu.
I've monitored through MSI afterburner and nothing is maxing out - GPU usage sitting 30-40%, CPU 30-50% overall
(only core 1 is even close to maxing out, hitting 80+% use), RAM usage under half at 6-7GB.
Something is definitely not right here.

Yes matey your not alone.
After the latest Diasateruos "Beyond" patch i get blu screen of death if i dare to try to "Warp" anywhere, or change settings. Even get the blu death when quitting the thing to desktop myself, and i have no other issues with any other games. like witcher 3 etc.
Ive built my own rigs for 30 years now etc etc.

I did manage to get into settings long enough to reduce everything to standard lame loser mode, and it made the game run a little longer but looks crap sloed down to a crawl and basicly piss you off.
Enough with this carp, its 2019 for gods sake
Blu Screen of death after a patch? Seriosly?

Cant wait to see the next lame barrage of excuses from Shuan the sheep? Good luck with it. by the way im on a poultry Asus Nvidia 1060 3gb so youve no chance with a GTX 970?

Same, man.

Bummer, I was pleasantly suprised how well it ran before the update, had only just got into the game. Browsing various forums it seems like a real mixed bag - people saying the update made better, people saying worse/same, people with same rig as me running flawless and people with better rigs also having issues. So many variables.

Tried a DDU and total reinstall of graphics drivers on someones advice, but no diff.